Equalizer structure for masonry saws



March 1960 R. JANOWITZ 2,92 7,5 72

EQUALIZER STRUCTURE FOR MASONRY SAWS' Filed March 16, 1959 EQUALIZER STRUQTURE FOR MASONRY Robert Janowitz, Kansas City, Mo, assiguor to Clipper .tion whatsoever.

' A further important objectof the invention is to provide an equalizer assembly of thecharacter referred .tofabove wherein the cutter assembly 'maybe locked snws Manufacturing Company, Kansas City, Mo a corporation of Missouri Application March 16, 1959, Serial No. 799,568 7 Claims. 01. 125-13 This invention relates to improvements in masonry saws of the type disclosed in US. Patent No. 2,835,243, and

has for its primary object to provide an improved presinterconnecting the platform of a masonry saw mounting the cutter assembly, to a vertically reciprocable rod connected to mechanism forming a part of the saw for raising and lowering the cutter assembly, with the present equalizer assembly being inexpensive to manufacture, simple to operate and effective in permitting the cutter assembly to swing vertically when the cutter blade strikes ;an immovable object or in the alternative, providing lock- .ing of such cutter assembly against any vertical reciproc aagainst vertical movement or placed in condition for vertical shifting when the same strikes an immovable object, by the simple expedient of shifting a pin forming a part of the equalizer assembly.

Also an important object of the invention is to provide means for biasing the cutter assembly toward one end of its path of travel, notwithstanding the fact that the same may shift upwardly when the blade strikes a relatively hard object.

Other important objects and detailsof construction of g the present equalizer assembly will become obvious or be 2,92?,5?2 .latented Mar. 8, 1956 of a hand wheel 34 which rotates a screw having a follower nut thereon (all not shown) and which follower nut .pivotally connects with triangle 2% at 36. A pair of rods 38 at the rearmost end of the machine are fixed to support 29 at the uppermost ends thereof and pivotally connected with triangle 28 at 4-6.

Swinging movement of assembly 12 about the horizontal shaft 18 and independent of the adjustment of the height of shaft 18 through use of. the hand wheel 34, .is accomplished by depressing a foot lever 42 against the action of a spring 44, the vertically swingahle lever 42 being pivotally coupled with triangle 28 by a-short shaft 46 disposed horizontally, as illustrated in Fig. 1. The rearmost and normally lowermost end of lever 42 is cou pled with a vertically reciprocable actuator rod 48 by a pivot pin Stl, the rod 48 extending through a clearance opening 52 in support 20.

The improved pressure equalizer assembly comprising the subject matter of the present invention and operably interconnecting platform 14 with actuator rod 48 is broadly numerated by the number 54 and is shown in its preferred form in detail in Figs. 2 to 4 inclusive. As

indicated therein, assembly 54 comprises an elongated ."se'ction 56 secured to the uppermost end of rod 48 in .ment 62 secured to the uppermost end of section 56 in explained in detail as the following specification pro gresses.

In the drawing: a

Figure l is a side elevational view of a masonry saw employing the pressure equalizer assembly forming the subject matter of the instant invention;

Fig. 2 is an enlarged, fragmentary, vertical sectional view showing the pressure equalizer assembly for the machine illustrated in Fig. 1;

Fig. 3 is a fragmentary, enlarged, side elevational view of another side of the equalizer assembly illustrated in Fig. 2; and

Fig. 4 is a fragmentary, enlarged, horizontal, crosssectional view taken substantially on the line 44 of Fig. 3 and looking in the direction of the arrows.

For a complete and full understanding of the operation and construction of masonry saw 10, reference is hereby made to U.S. Patents No. 2,835,243 and No. 2,863,440. For the purposes of this description, it is only necessary to indicate that the cutter assembly 12 is mounted on a vertically swingable platform 14 between the uppermost extended ends of a pair of rear legs 16 and carried by a horizontal shaft 18, as best shown in Fig. 2. Shaft 18 is in turn attached to a support 20 and the latter is pivotally attached to legs 16 by a pair of arms 22. Platform direct overlying relationship thereto. As best shown in Fig. 2, block element 62 is provided with an upwardly extending notch 64 therein in direct alignment with guide slot 5%. Element 62 is also provided with a horizontal bore 66 therethrough in spaced relationship to notch 64 and therebyguide slot 60, and substantially in parallelism with the transverse length of notch 64.

A substantially U-shaped bracket broadly designated 68 issccured to platform 14- adjacent the end thereof remote from disc 24 and includes a'relatively flat bight portion 70 welded to the under, relatively fiat, face of platform 14, while'integral, depending plates or legs 72 and,74 embrace with horizontally aligned openings 76 therein which are adapted to be disposed in alignment with bore 66 or guide I; slot 6%} respectively. I

A coil spring 73 is positioned in surrounding relationship to section 56 and bears at opposed ends thereof against the lower face of element 62 and shoulder 80 presented by the uppermost edge margin of actuator rod 48.

A pin generally designated 32 is normally disposed in openings 76 and either bore 66 or guide slot 60 respectively and thereby includes a main leg 84 which is of greater length than the distance between the outermost surfaces of opposed plate legs 72 and '74 respectively and is provided with an integral, laterally extending first leg 36 at one extremity thereof and a second leg 88 pivotally connected to the opposite extremity of main leg 84. It is to be understood that second leg 88 may be swung to a position in substantial axial alignment with main leg 8%, whereby pin 82 may be withdrawn from openings It can now be perceived that when pin 82 is disposed within guide slot 60, disc 24 on cutter assembly 12 is free to move upwardly when the same strikes a relatively immovable or solid object by virtue of platform 14 swinging about the axis of horizontal shaft 18. Coil spring 78 operates to return platform 14 to its normal position after disc 24 clears the object within the path of rotation thereof.

However, when the operator desires to lock platform 14 against swinging movement, this may readily be accomplished by rotating leg 88 of pin 82 to a position in direct alignment with main leg 84, whereby pin 82 may be removed from openings 76 and guide slot 60 and thereafter readily slipped through bore 66 when the latter is moved into alignment with openings 76. In this position, movement of platform 14 relative to actuator rod 43 is precluded, notwithstanding the fact that disc 24 may strike a solid object or the like.

Having thus described the invention what is claimed as new and desired to be secured by Letters Patent is:

1. In a saw provided with a frame, a platform mounted on the frame for pivoting movement about a substantially horizontal axis, a cutter assembly secured to one extremity of the platform for vertical reciprocation therewith, and mechanism on the frame beneath said platform for pivoting the latter to shift the cutter assembly and including a vertically reciprocable rod, the improvement of which comprises structure for pivotally interconnecting said platform and the rod and including a section adapted to be disposed on the upper portion of said rod and provided with an elongated, upright guide slot therein; and means adapted to be secured to said platform for interconnecting the section and said platform and including a component movable from a position slidable in said slot to permit vertical reciprocaction of the platform and thereby the cutter assembly relative to the rod, to a location locking said platform against shifting movement relative to the rod.

-2. In a saw provided with a frame, a platform mounted on the frame for pivoting movement about a substantially horizontal axis, a cutter assembly secured to one extremity of the platform for vertical reciprocation therewith, and mechanism on the frame beneath said platform for pivoting the latter to shift the cutter assembly and including a vertically reciprocable rod, the improvement of which comprises structure for pivotally interconnecting said platform and the rod and including a section adapted to be disposed on the upper portion of said rod for movement therewith and provided with an elongated, upright guide slot therein; bracket means adapted to be secured to said platform in a position to normally embrace the upper extremity of said section; and means movably mounted on said section and engageable with said bracket means for connecting the latter to said section, said means being shiftable from a position slidable in said slot to permit vertical reciprocation of the platform and thereby the cutter assembly relative to the rod, to a location locking said platform against shifting movement relative to the rod.

3. The improvement as set forth in claim 2 wherein is provided means for biasing the platform away from the rod when said component is disposed within said guide slot in the section 4. In a saw provided with a frame, a platform mounted on the frame for pivoting movement about a substantially horizontal axis, a cutter assembly secured to one extremity of the platform for vertical reciprocation therewith, and mechanism on the frame beneath said platform for pivoting the latter to shift the cutter assembly and including a vertically reciprocable rod, the improvement of which comprises structure for pivotally interconnecting said platform and the rod and including a section adapted to be disposed on the upper portion of said rod for movement therewith and provided with an elongated, upright guide slot therein; an element secured to the upper extremity of the section and provided with a bore therethrough out of alignment with said guide slot; bracket means adapted to be secured to said platform in a position to normally embrace said element and the upper extremity of the section, said bracket means being provided with openings therethrough alignable with said guide slot or the bore; and a component movably disposed within said openings in the bracket and shiftable from a position extending through said openings and slidably disposed in said slot to permit vertical reciprocation of the platform and thereby the cutter assembly relative to the rod, to a location extending through said openings and the bore to thereby lock the platform against shifting movement relative to the rod.

5. The improvement as set forth in claim 4 wherein said section is disposed to present an upwardly facing shoulder between the rod and the section, and a coil spring surrounding said section and engaging the shoulder and said section respectively, said component acting against said spring as the component slides in said guide.

slot.

6. The improvement as set forth in claim 4 wherein said bracket means includes a pair of substantially vertical plates adapted to be secured to the underface of the platform and provided with horizontally aligned openings therein disposed to be aligned with said guide slot and said bore respectively.

7; The improvement as set forth in claim 6 wherein said component includes a substantially L-shaped part having a main leg adapted to extend through said openings and the'bore or said slot, a laterally extending second leg integral with one extermity of said main leg, and a third leg pivotally secured to the opposite extremity of said main leg, said second and third legs being normally spaced apart a distance greater than that between opposed outer faces of said plates.

No references cited. 

